1. Faculty of Pharmaceutical Sciences, Setsunan University, 45-1, Nagaotoge-cho, Hirakata, Osaka 573-0101, Japan
2. Life Science Materials Laboratory, ADEKA Co., 7-2-34, Higashiogu, Arakawa-ku, Tokyo 116-8553, Japan
3. Faculty of Medicine, University of Miyazaki, Kihara 5200, Kiyotake, Miyazaki 889-1692, Japan
4. Center for Chronic Viral Diseases, Kagoshima University, 8-35-1, Sakuragaoka, Kagoshima 890-8544, Japan